Watson, the IBM computer system that triumphed over human competitors on Jeopardy two years ago, is venturing into the health care field. But Watson now wants to help rather than defeat humans. Just how that can be done was explained by IBM officials in an appearance at the University of Rochester Medical Center on Friday. The "Big Data, Analytics and Watson Symposium," hosted by UR, discussed Watson in the context of making the best use of the massive amount of information now available for health care.